Method of coating



July 14, 192s. r 1,545,874

P. C. ANDREWS METHOD OF COATING Filed June 5, 1924 Patented July 14, 1925.

UNITED STATES PERRY C. ANDREWS, F VINCENNES, INDIANA.

METHOD 0F COATING.

Application led June 3,

' To all whom it may concerne: y

-Be it known that I, PERRY C. ANDREWS, a citizen of the United States, residing at Vincennes, in the county of'Knox and State of Indiana, have invented certain new and useful Improvements in a Method of Coating, of which the following is a specification. This invention relates to a method of coating pipes and the like, the invention linding particular utility in applying protective coatings to well casings and the like. In drilling wells, for oil for instance, water is generally encountered at certain depths and in order to shut 0E the flow of this water an iron casing is-lowered into,the well. The life of this casing is of relatively short duration due to the action of the water upon the same. Many substances are em'- ployed in coating these casings or pipes to prevent the rapid decay and deterioration but in all instances, as far as I am aware, the application of this protective Substance is made on top of the ground before the pipel or casing is lowered into the hole. Coating these casings prior to lowering the same into the hole has been found to be unsatisfactory for many reasons but mainly because the tools which grip the casing and the/engagement of the casing with the sides of the hole removes the protective coating at various places throughout th\casing, thus leaving these surfaces bare and unprotected. -By means of my improved method these objections and inefliciencies are eliminated and the protective coating is applied while the casing'is being lowered into the hole. Therefore the application of the coating is A rendered more efficient land the possibility of leaving bare or unprotected spots on the casing is eliminated.

My improved method will be made more apparent as this description proceeds, especially when considered in. connection with the accompanying drawing which shows semi-diagrammatically the application of this method. v Referring now to the drawing, it will be noted that the reference character 10 indicates the hole formed'Y in the earth by #the customary process of drillin and in whichv the casing or pipe 11 is a apted to be lowered. In drilling a well, for instance for. oil, water 12 is encountered atoertain 1924. sum1 No. 717,666. i

depths, the flow of which is adapted to be checked by the lowering of the casing 11.

These casings orpipes 11 are customarily formed in joints or sections of a length `'which permits ofl convenient handling during assembling or disassembling and in carrying out my improved method I propose to first paint the lowermost section or length of the casing 13 suicient to extend down into the water 12. This section or length of casing is painted before the casing is lowered into the hole. The painted or coated portion 13 is then lowered through the water level. The substance to be applied to the pipe is then poured into the hole on the outside of the casing where it accumulates on top of the water as indicated at 14. When the casing is thereafter lowered further into the hole the substance 14L is apr' plied to the casing as the casing passes therethrough. The application of this protective coating substancev 14: occurs without further attention on thepart of the operator, it being only neceary to exercise care that a suflicient amount ofthe protective coating material 14 is supplied to the hole. Obv1ously,\the casing 1s gripped by the holdingtools `adjacent the top of the hole and before the protective coating has been applied so that interference from this score with the complete and thorough coating off the casing is eliminated.

Obviously, the protective substance 14:

may be paint, asphalt or any other suitable ,e material :which may be used for preserving the casing and protecting the same against decay and deterioration b the action of the water. The amount of t is rotective material poured into thehole wi depend upon `the extent to which the casii is to be .lowered within the hole.

from the drawings that the surface 15 is the surface painted before the casin is lowered while thelfsurface 16 is coa by It wi be noted passing through the coating. substance 14..

The surface 17 is yet uncoated but will have applied thereto the protective coating as the samel passes downwardly through the substance 14.

From the foregoing it willbe immediately apparent'that a simple and eiiicient method is presented herewith for applying Y coat- .ings of a protective substance to pipes, casings and the like used in connection with drilling of wells. Obviously, the character of the protective substance forms no important part of this invention and any suitable and desired material may be employed.

VHaving thus described my invention, what I claim is:

l. The method of applying va protective coating to Well casings and the like which consists in lowering the casing into the hole toa point below the water level, supplying a quant-ity of protective coating substance into the hole around the casing and lowering the casing into the hole through said supply of protective coating substance.

2. The method of applying a protective coating to well casings and the like which consists in coating a section of the casing and lowering the painted section of the casing into the hole below the water level, pouring a quantity of protective coating material into the hole around the casing Whereby said protective coating material is deposited on top of the Water and then lowering the casing further into the hole through said supply of 'protective coating material.

The foregoing specication signed at Vincennes, Indiana, this 26th day of May, 1924.

PERRY C.' ANDREWS. 

